摘要：
Ion-selective electrodes (ISEs) have significant superiority in monitoring water samples and various functional materials have been explored as solid contacts (SCs) to improve the detection reliability. However, water layer usually destroys the interfaces among electron collector, SCs and ion-selective membranes, especially in monitoring complicated actual wastewater, resulting in instability or loss of function. Here we demonstrate that surface hydrophobization of SCs is a feasible approach to minimize adverse effect of water layer on unstable SCs adhered to electron collector, ensuring long-term reliability of ISEs in actual wastewater monitoring. Though NH4+-ISE with MoOx @polyaniline composite SC has low standard deviations (SDs) of the standard potential (E0) measured in NH4+ standard solutions, Nernstian slopes are dramatically reduced from 58.66 to 27.65 mV/dec after 16-day actual wastewater monitoring. Accordingly, measured NH4+ concentrations of actual wastewater have a high degree of inaccuracy up to ca. 850%. In contrast, the ISE with a superhydrophobic SC has a slope closer to the ideal Nernstian slope, lower potential drift and E0 SDs, and higher resistance against external interferences, due to water layer inhibition of the SC. Importantly, superhydrophobic SC-ISE shows a near-Nernstian response in steady state and accurate NH4+ concentration determination during 30-day actual wastewater monitoring.
摘要：
This study aimed to investigate the storage stability and functional properties of different sizes of tea polysaccharides, and explore the relationship between sizes and digestive properties, so as to provide reference for the subsequent utilization of tea polysaccharides. In this study, TPS-NPs of about 200 nm and 400 nm were prepared by electrostatic interaction with TPS and EDTA ratios of 6:1 and 100:1, respectively. The structural properties of TPS-NPs were investigated by a series of characterization analyses. The results showed that the major functional groups of TPS-NPs did not change significantly with particle size, but the C--O stretching vibrations in the methylated carboxyl group were more pronounced. However, their DPPH free radical scavenging ability and antioxidant activity of TPS were decreased in vitro because of the destruction of the apparent structure of tea polysaccharides nanoparticles during preparation. Stability measurements revealed that TPS-NPs have high storage, temperature, pH and ionic concentration stability, especially for TPS-NPs with a particle size of 200 nm. The digestibility of 400 nm TPS-NPs was improved to 3.89% compared to TPS. The results showed that the TPS-NPs has excellent stability and digestibility, which contributed to the development of TPS applications in the food industry and related products.
摘要：
Design and development of low-cost, high-efficient, metal-free persulfate heterogeneous catalysts was a hot research topic. Herein, porous pie-like nitrogen-doped biochar (NBC) was prepared by one step high temperature pyrolysis of rape straw, urea and ZnCl2 mixture, and applied for peroxymonosulfate (PMS) activation toward sulfamethoxazole (SMX) degradation. Among these as-prepared catalysts, the NBC2.0 sample presented the best catalytic activity, with the 99.8 % SMX degradation efficiency in 5 mins and the 81.7 % total organic carbon (TOC) removal rate in 30 mins. Additionally, it could realize an excellent SMX degradation in the wide pH range of 3.0 to 9.0, and possessed the high degradation efficiency in presence of various organic pollutants or in real water environments, indicating its good pH adaptability, universality and practicality. Mechanistic investigations disclosed that the NBC2.0/PMS/SMX system involved both radical and non-radical degradation pathways, with singlet oxygen ( 1O2) and the direct electron transfer mechanism being the main contributors. The main active reaction sites of NBC were graphitic N, pyridinic N and C = O group, as corroborated by density functional theory (DFT) calculation and X-ray photoelectron spectroscopy (XPS) measurement. The possible SMX breakdown routes were determined by intermediate identification. This work provides a promising metal-free persulfate catalyst for environment remediation.
摘要：
To date, the exploration of zwitterionic application is confined to the function of electrolyte's additives to improve the properties of the electrolytes. However, reports on the unique properties of zwitterions, namely the anti-polyelectrolyte effect (APE), as the regulators of the electrochemical stability windows (ESWs) of the zwitterionic electrolytes are scarce. Herein, a zwitterionic electrolyte system is designed and study the relationship between the APE and the ESWs of the zwitterionic electrolytes. The hydrogen/oxygen evolution in the zwitterionic electrolytes is significantly inhibited under the action of the APE. On this basis, the ESWs of zwitterionic electrolytes can be expanded, ultimately achieving an effective improvement in the energy density of zinc-ion hybrid capacitors (ZHCs). The sulfonic-based zwitterionic hydrogel electrolytes prepared based on this strategy achieve a wide ESW of 2.58 V and high ionic conductivity of 29.3 mS cm-1. Meanwhile, the corresponding ZHCs possess a high working voltage of 2.1 V (1.6 V for the traditional ZHCs), a high capacity of 188.9 mAh g-1 and a high energy density of 110 Wh kg-1. The way utilizing the APE of zwitterions to expand the ESWs opens up a new avenue to improve the energy density of energy storage devices. The anti-polyelectrolyte effect is an effective approach to improve the hydration ability of salt-responsive zwitterions, thereby effectively inhibiting the activity of water and expanding the electrochemical stability window of zwitterionic hydrogel electrolytes. The zwitterionic hydrogel electrolytes based on this strategy can achieve high working voltage, thus endowing the corresponding zinc-ion hybrid capacitors with high energy density.image
摘要：
A novel AEM with good strength and flexibility was synthesized by combining rigid PPO and flexible PVA. Dual cationic groups were added to improve ion concentration and create ion channels, enhancing ion conductivity. Cross‐linking and phase separation improved the AEM's resistance to alkali. Abstract A series of cross‐linked AEMs (c‐DQPPO/PVA) are synthesized by using rigid polyphenylene oxide and flexible poly(vinyl alcohol) as the backbones. Dual cations are grafted on the PPO backbone to improve the ion exchange capacity (IEC), while glutaraldehyde is introduced to enhance compatibility and reduce swelling ratio of AEMs. In addition to the enhanced mechanical properties resulting from the rigid‐flexible cross‐linked network, c‐DQPPO/PVA AEMs also exhibit impressive ionic conductivity, which can be attributed to their high IEC, good hydrophilicity of PVA, and well‐defined micro‐morphology. Additionally, due to confined dimension behavior and ordered micro‐morphology, c‐DQPPO/PVA AEMs demonstrate excellent chemical stability. Specifically, c‐DQPPO/PVA‐7.5 exhibits a wet‐state tensile strength of 12.5 MPa and an elongation at break of 53.0 % at 25 °C. Its OH− conductivity and swelling degree at 80 °C are measured to be 125.7 mS cm−1 and 8.2 %, respectively, with an IEC of 3.05 mmol g−1. After 30 days in a 1 M NaOH solution at 80 °C, c‐DQPPO/PVA‐7.5 experiences degradation rates of 12.8 % for tensile strength, 27.4 % for elongation at break, 14.7 % for IEC, and 19.2 % for ion conductivity. With its excellent properties, c‐DQPPO/PVA‐7.5 exhibits a peak power density of 0.751 W cm−2 at 60 °C in an H2‐O2 fuel cell.
作者机构：
[Juntao Zhang; Haofei Xu; Yang Liu; Peishan Sui; Fen Deng; Tianyi Liu; Benmei Wei; Chengzhi Xu] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, China;College of Life Science and Technology, Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, Hubei Engineering University, Xiaogan, Hubei, China +86 27 83956763 +86 27 83956763;Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Hubei Key Laboratory of Lipid Chemistry and Nutrition, Wuhan, Hubei, China;[Mingming Zheng] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, China<&wdkj&>Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Hubei Key Laboratory of Lipid Chemistry and Nutrition, Wuhan, Hubei, China;[Haibo Wang] College of Life Science and Technology, Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, Hubei Engineering University, Xiaogan, Hubei, China
通讯机构：
[Haibo Wang] C;College of Life Science and Technology, Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, Hubei Engineering University, Xiaogan, Hubei, China
摘要：
Collagen-based hydrogels have been widely used as biomaterials in recent years owing to their excellent biological properties. However, their poor mechanical properties due to the poor solubility of native collagen under physiological conditions limit their application. In this case, although the solubility of collagen can be improved by succinylation, the gelation of succinylated collagen (SCol) is another challenge. Herein, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) was used to induce the gelation of SCol based on the formation of anhydride bonds between the carboxyl groups of SCol. The concentration of the SCol system was increased to 30.0 mg mL−1, which was much higher than that of the collagen system (10 mg mL−1). Correspondingly, the elastic modulus (G′) of SCol hydrogels was improved to 310 Pa, which was higher than that of the collagen hydrogel (20 Pa). Notably, the triple helix of SCol is crucial for its EDC-induced gelation. The transmittance, porosity, and water content of the SCol hydrogel were studied. Additionally, the cytocompatibility of the SCol hydrogel was explored using CCK8 colorimetry and confocal microscopy. This study provides a novel strategy for improving the mechanical properties of hydrogels by increasing collagen concentration, which is helpful for the design and application of collagen-based materials.
作者机构：
[Chulong Jin; Hanlei Peng; Xiaojun Zeng] School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China;[Zhenyuan Liu] School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;[Deng Ding] College of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
[Xiaojun Zeng] S;[Deng Ding] C;School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China<&wdkj&>College of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China
关键词：
Metal phosphides;Prussian blue nanocubes;Ti3C2 MXene ribbons;Interfacial matching;OER
摘要：
The development of MXene-based heterostructures for electrocatalysis has garnered significant attention owing to their potential as high-performance catalysts that play a pivotal role in hydrogen energy. Herein, we present a multistep strategy for the synthesis of a Ti3C2 MXene ribbon/NiFePx @graphitic N-doped carbon (NC) heterostructure that enables the formation of three-dimensional (3D) Ti3C2 MXene ribbon networks and bimetallic phosphide nanoarrays. With the assistance of HF etching and KOH shearing, the MXene sheets were successfully transformed into 3D MXene networks with interlaced MXene ribbons. Notably, a hydrothermal method, ion exchange route, and phosphorization process were used to anchor NiFePx@NC nanocubes derived from Ni(OH)2/NiFe-based Prussian blue (NiFe-PB) onto the MXene ribbon network. The resulting MXene ribbon/NiFePx@NC heterostructure demonstrated enhanced oxygen evolution reaction (OER) activity, characterized by a low overpotential (164 mV at a current density of 10 mA cm−2) and a low Tafel slope (45 mV dec−1). At the same time, the MXene ribbons/NiFePx@NC heterostructure exhibited outstanding long-term stability, with a 12 mV potential decay after 5000 cyclic voltammetry (CV) cycles. This study provides a robust pathway for the design of efficient MXene-based heterostructured electrocatalysts for water splitting.
通讯机构：
[Wang, HB ] H;Hubei Engn Univ, Coll Life Sci & Technol, Hubei Key Lab Qual Control Characterist Fruits & V, Xiaogan, Hubei, Peoples R China.
关键词：
Fish scale collagen hydrolysate;Plastein reaction;Antioxidant properties;Reactive oxygen species
摘要：
An important area of focus for developing antioxidant collagen hydrolysates (peptides) involves enhancing the antioxidant properties of collagen hydrolysates. In this study, fish scale collagen hydrolysate (FH) was used as the raw material for plastein reaction. Various enzymes, including papain, alcalase, flavourzyme, and the combination of alcalase and flavourzyme, were employed for this purpose. The plastein reaction significantly improved the thermal stability, chemical antioxidant activity, and capacity to scavenge cellular reactive oxygen species of FH. Notably, the plastein reaction catalyzed by alcalase exhibited the most significant improvement, increasing the hydroxyl radical scavenging rate from 72.3 to 93.4% and restoring the viability of the oxidative stress-induced HepG2 cell model from 50.8 +/- 1.7 to 74.9 +/- 1.7%. During the plastein reaction, condensation and hydrolysis reactions occurred simultaneously, with condensation being the dominant process. These reactions, along with physical aggregation, facilitated the formation of larger yet more concentrated collagen peptide aggregates, leading to increased exposure of hydrophobic groups. This enhanced the uptake of collagen hydrolysates by the cells and contributed to the enhancement of their antioxidant properties. Thus, the plastein reaction is an effective method for enhancing the antioxidant properties of collagen hydrolysates, with its simplicity of operation and promising application potential.
摘要：
A hydrogel composite verteporfin‐carboxymethyl chitosan‐oxidized sodium alginate (VP‐CMCS‐OSA) of CMCS and OSA, with loading anti‐fibrotic drug VP, is developed based on two‐step chemical reactions. The VP‐CMCS‐OSA hydrogel demonstrates the properties of high tissue adhesion, strong self‐healing, and tensile ability, and prompts full‐thickness skin wound healing due to the synergistic effects of hydrogels and verteporfin administration. Abstract Full‐thickness skin defect has always been a major challenge in clinics due to fibrous hyperplasia in the repair process. Hydrogel composite dressings loaded with anti‐fibrotic drugs have been considered as a promising strategy for scarless skin regeneration. In this work, a hydrogel composite (VP‐CMCS‐OSA) of carboxymethyl chitosan (CMCS) and oxidized sodium alginate (OSA), with loading anti‐fibrotic drug verteporfin (VP), is developed based on two‐step chemical reactions. Verteporfin is bonded with carboxymethyl chitosan through EDC/NHS treatment to form VP‐CMCS, and then VP‐CMCS is crosslinked with oxidized sodium alginate by Schiff base reaction to form VP‐CMCS‐OSA hydrogel. The characterization by SEM, FTIR, and UV–Vis shows the microstructure and chemical bonding of VP‐CMCS‐OSA. VP‐CMCS‐OSA hydrogel demonstrates the properties of high tissue adhesion, strong self‐healing, and tensile ability. In the full‐thickness skin defect model, the VP‐CMCS‐OSA composite hydrogels hasten wound healing due to the synergistic effects of hydrogels and verteporfin administration. The histological examination reveals the regular collagen arrangement and more skin appendages after VP‐CMCS‐OSA composite hydrogel treatment, indicating the full‐thickness skin regeneration without potential scar formation. The outcomes suggest that the verteporfin‐loaded composite hydrogel could be a potential method for scarless skin regeneration.
摘要：
Customized control of the biological response between the material matrix and cells is a crucial aspect in the development of the next generation of collagen materials. This study aims to investigate the effects of ultrahigh pressure treatment on the interaction between collagen and cells by subjecting bovine tendon collagen to different intensities of ultrahigh pressure field. The results indicate that ultrahigh pressure treatment alters the spatial folding of collagen, causing distortion of its triple helical conformation and exposing more free amino groups and hydrophobic regions. As a result, collagen's cell adhesion capability and ability to promote cell migration are significantly enhanced. Optimal cell adhesion and migration capabilities are observed in collagen samples treated at 500 MPa for 15 min. However, further increasing the intensity of the ultrahigh pressure treatment leads to severe damage to the triple-helical structure of collagen, along with re-aggregation of free amino groups and hydrophobic moieties, thereby reducing collagen's cell adhesion capability and ability to promote cell migration. Therefore, ultrahigh pressure treatment offers a promising method to effectively regulate collagen-cell adhesion and promote cell migration without the need for external components. This provides a potential means for the customized enhancement of collagen-based material interfaces.
摘要：
Preparing AEMs with robust mechanical properties, high ionic conductivity and excellent chemical stability is challenging. Here, cross-linked/aggregated AEMs are prepared by incorporating hydrophilic Jeffamine cross-linkers and hydrophobic side chains into the rigid quaternized poly (vinyl benzyl chloride). Jeffamine's flexibility ensures high elongation at break of the cross-linked/aggregated membranes (125.0-199.8%). The hydrophobic side chain limits excessive water absorption and facilitates self-aggregation of hydrophilic and hydrophobic domains, enhancing tensile strength (5.08-7.40 Mpa in wet state) and improving ionic conductivity of the AEMs (73.8-110.4 mS cm(-1) at 80 degrees C). Alkali-resistant PVB, restricted dimensionality, and ordered micro-phase separation morphology contribute to outstanding chemical stability of the AEMs. Degradation of both backbones and cations is <20% after treatment in 1 M NaOH solution at 80 degrees C for 30 days. Based on the membrane, a peak power density of 354.4 mW cm(-2) at 60 degrees C is yielded.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
摘要：
Removal of technetium from radioactive waste has become attractive due to its huge environmental hazard. Herein, a series of n-alkyl-imidazolium ionic liquids functionalized cellulose microspheres (MCC-[C(n)VIm]Br, n = 2, 4, 6, 8, 10) were synthesized by radiation method, and their grafting regularity were investigated. In order to explore the effect of alkyl chain length on adsorption performance, the adsorption behaviors of MCC-[C(n)VIm]Br for TcO4-/ReO4- were researched in detail via batch and column experiments. MCC-[C(n)VIm]Br exhibited high ReO4- adsorption efficiency over a wide pH range from 4 to 9, and the maximum adsorption capacity was 230.41 mg/g. The adsorption efficiency of MCC-[C(n)VIm]Br barely changed after 5 times reused. Remarkably, the selectivity of ReO4- enhanced with the increase of alkyl chain length, while the adsorption capacity and rate were hardly affected by it. The column experiment showed that MCC-[C(10)VIm]Br can selectively capture ReO4- from simulated Beishan groundwater. The adsorption performance suggested that MCC-[C(10)VIm]Br is promising for high-efficiency uptake of ReO4- from Beishan groundwater and other radioactive wastes.
作者机构：
[Tingting Zhang] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei 430023, China;[Shuaike Lv; Shaoxian Song] School of Resources and Environmental Engineering, Wuhan University of Technology, Wenzhi Street 34, Wuhan, Hubei 430070, China;[Hiram Joazet Ojeda Galván; Mildred Quintana] Facultad de Ciencias, Universidad Autonoma de San Luis Potosi, Av. Parque Chapultepec 1570, 78210, San Luis Potosi, Mexico;Wuhan Clayene Technology Co., Ltd., Tangxunhu North Road 36, Wuhan, Hubei 430223, China;[Lingjie Zhang] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei 430023, China<&wdkj&>School of Resources and Environmental Engineering, Wuhan University of Technology, Wenzhi Street 34, Wuhan, Hubei 430070, China<&wdkj&>Facultad de Ciencias, Universidad Autonoma de San Luis Potosi, Av. Parque Chapultepec 1570, 78210, San Luis Potosi, Mexico
通讯机构：
[Tingting Zhang] S;School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei 430023, China
摘要：
Driven by technology advancement and wide application of lithium, the market demand for lithium is skyrocketing. To enable the sustainable supply of lithium, it is strongly desirable to extract lithium from various resources, especially salt lake brine with 60% of global lithium content. Recently, adsorption has served as a critical procedure for selective lithium extraction from brines, in particular those with high Mg2+/Li+ ratios. Herein, a comprehensive review of lithium adsorbents from nano structural and compositional effects to industrial applications is performed. Firstly, lithium adsorbents are fully summarized, involving the common types, structure-performance relationships, lithium intercalation and deintercalation mechanisms at the ionic level, and current limitations of various adsorbents. Based on these summaries, a performance heatmap is created to visualize the performance of lithium adsorbents. To serve the industrial demands, the shaping techniques and factors influencing extraction properties are then discussed. Further, the industrial cases of different lithium adsorbents and universal strategies of lithium extraction from brines to Li2CO3 products using adsorbents are demonstrated, providing technical references for industrial applications. Finally, recommendations and perspectives on larger-scale development of lithium adsorbents are proposed. Overall, this review not only offers in-depth insight into lithium extraction from brines with high Mg2+/Li+ ratios, but also inspires the development and design of next-generation lithium adsorbents with unprecedented properties.
作者：
Zhang, Meifang;Liang, Xiangfei;Gao, Yang;Liu, Yi
期刊：
Materials,2024年17(5):1206- ISSN：1996-1944
通讯作者：
Xiangfei Liang<&wdkj&>Yi Liu
作者机构：
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;Authors to whom correspondence should be addressed.;[Zhang, Meifang; Gao, Yang] Institute of Carbon Neutral New Energy Research, Yuzhang Normal University, Nanchang 330031, China;[Liang, Xiangfei] Authors to whom correspondence should be addressed.<&wdkj&>Institute of Carbon Neutral New Energy Research, Yuzhang Normal University, Nanchang 330031, China;[Liu, Yi] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China<&wdkj&>Authors to whom correspondence should be addressed.
通讯机构：
[Xiangfei Liang] A;[Yi Liu] S;School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>Institute of Carbon Neutral New Energy Research, Yuzhang Normal University, Nanchang 330031, China
摘要：
The inherent properties of TiO(2), including a wide band gap and restricted spectral response range, hinder its commercial application and its ability to harness only 2-3% of solar energy. To address these challenges and unlock TiO(2)'s full potential in photocatalysis, C(60)- and CdS-co-modified nano-titanium dioxide has been adopted in this work to reduce the band gap, extend the absorption wavelength, and control photogenerated carrier recombination, thereby enhancing TiO(2)'s light-energy-harnessing capabilities and hydrogen evolution capacity. Using the sol-gel method, we successfully synthesized CdS-C(60)/TiO(2) composite nanomaterials, harnessing the unique strengths of CdS and C(60). The results showed a remarkable average yield of 34.025 μmol/h for TiO(2) co-modified with CdS and C(60), representing a substantial 17-fold increase compared to pure CdS. Simultaneously, the average hydrogen generation of C(60)-modified CdS surged to 5.648 μmol/h, a notable two-fold improvement over pure CdS. This work opens up a new avenue for the substantial improvement of both the photocatalytic degradation efficiency and hydrogen evolution capacity, offering promise of a brighter future in photocatalysis research.
摘要：
A novel Mn/TiO(2) catalyst, prepared through modification with the rare-earth metal Dy, has been employed for low-temperature selective catalytic reduction (SCR) denitrification. Anatase TiO(2), with its large specific surface area, serves as the carrier. The active component MnO(x) on the TiO(2) carrier is modified using Dy. Dy(x)Mn/TiO(2), prepared via the impregnation method, exhibited remarkable catalytic performance in the SCR of NO with NH(3) as the reducing agent at low temperatures. Experiments and characterization revealed that the introduction of a suitable amount of the rare-earth metal Dy can effectively enhance the catalyst's specific surface area and the gas-solid contact area in catalytic reactions. It also significantly increases the concentration of Mn(4+), chemisorbed oxygen, and weak acid sites on the catalyst surface. This leads to a notable improvement in the reduction performance of the DyMn/TiO(2) catalyst, ultimately contributing to the improvement of the NH(3)-SCR denitrification performance at low temperatures. At 100 °C and a space velocity of 24,000 h(-1), the Dy(0.1)Mn/TiO(2) catalyst can achieve a 98% conversion rate of NO(x). Furthermore, its active temperature point decreases by 60 °C after the modification, highlighting exceptional catalytic efficacy at low temperatures. By doubling the space velocity, the NO(x) conversion rate of the catalyst can still reach 96% at 130 °C, indicating significant operational flexibility. The selectivity of N(2) remained stable at over 95% before reaching 240 °C.
摘要：
The one‐step mildly synthesized carbon dots (CDs) achieve reversible switching between cyan and orange‐red emission by adjusting the [H+] under extremely acidic conditions. In combination with a smartphone, a fluorescent sensor is built based on CDs for the successful on‐spot visual detection of [H+]. Abstract It is a significant challenge to develop acidity probes suitable for use in extremely acidic conditions, especially to achieve real‐time on‐site detection. In this work, carbon dots (CDs) are synthesized on a gram‐scale under mild conditions using 3‐phenylpropionaldehyde as precursors. The CDs have excellent robustness, showing distinguished anti‐photobleaching and ionic stability. Dramatically, a visual transition of the fluorescent color of CDs from cyan to orange is observed when the concentration of H+ ([H+]) increased under high acidity conditions, owing to the generation of another emission peak in the red‐light region. Taking advantage of the optical properties, CDs are designed as a ratiometric sensing platform for the detection of extreme acidity. Furthermore, the platform for [H+] possesses high selectivity and excellent anti‐interference capability. In extremely acidic wastewater, I595 nm/I480 nm and [H+] maintain a very good linear relationship (R2 = 0.996). Moreover, a smartphone is employed to obtain the red‐green‐blue (RGB) values of the samples to realize hand‐held detection. By measuring the R/G, the platform exhibits ultrasensitive recognition of [H+] in the range of 1–9 mol L−1 with R2 of 0.992. This work paves an avenue for the design of rapid and on‐site CDs based sensors for critical environmental applications.
作者机构：
[Yulai Guo; Shengtao Chen; Xinming Li; Renjie Li; Jing Zhang; Tianyou Peng] College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China;[Jiangrong Xiao] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China
通讯机构：
[Jiangrong Xiao] S;[Tianyou Peng] C;College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China<&wdkj&>School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China
摘要：
The photocatalytic system that simulates the principle of photosynthesis is considered one of the most promising technologies for converting CO2 into chemical fuels. Herein, copper tetra(4-carboxyphenyl)porphyrin (CuPor)-ruthenium 2,6-bis(5-amino-benzimidazol-2-yl)pyridine pincer complex (RuN3) coupled polymer (CuPor-RuN3) is in-situ polymerized on hexagonal tungsten bronze Cs0.33WO3 (CsWO) nanoparticles to construct a novel CuPor-RuN3/CsWO composite photocatalyst with cascade charge transfer mechanism, where the inorganic–organic Z-scheme heterojunction at the CuPor-RuN3/CsWO interface and the Z-scheme molecular junction (-[CuPor-RuN3]-) within the polymer facilitate photoexcited electrons transferring from CuPor units to RuN3 ones, and finally enriching on Ru sites for boosting the CO2 reduction reaction (CO2RR). Under visible light irradiation and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole serving as electron donor, the resultant CuPor-RuN3/CsWO delivers average CO/CH4 yields up to 4645/89 μmol g-1h−1, corresponding to an overall photoactivity of 10002 μmol g-1h−1, which is 20 times higher than that of the single polymer. These results provide new ideas for exploring high-performance artificial photosynthesis system to convert CO2 into chemical fuels.
作者：
Zhang, X. Y.;Zeng, Y. W.;Tao, R. D.;Zhang, M.;Zheng, M. M.;...
期刊：
International Journal of Environmental Science and Technology,2024年 ISSN：1735-1472
通讯作者：
Mei, YJ
作者机构：
[Zeng, Y. W.; Mei, Y. J.; Mei, YJ; Zhang, X. Y.; Tao, R. D.; Zheng, M. M.; Zhang, M.; Qu, M. J.] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.
关键词：
Bio-denitrogenation;Nitrogen-cycling functional gene;Nitrogen removal;Simultaneous nitrification and denitrification
摘要：
Simultaneous nitrification and denitrification (SND) is cost-effective, and therefore it is a promising process for biological nitrogen removal. In this study, SND microbes were obtained through domestication of the sludge from Wuhan municipal wastewater treatment plant to enrich effective nitrogen removal SND microbes, to reveal the microbial structure of SND and the denitrogenation mechanism through the high-throughput sequencing technology and quantitative PCR. When NH4+-N (similar to 90.7 mg/) as a sole nitrogen source, the removal efficiency (RE) of NH4+-N in 24 h was 99.35%, and there was no accumulation of NO3--N or NO2--N. When NO3--N (similar to 101.79 mg/L) or NO2--N (similar to 106.00 mg/L) was the sole nitrogen source, respectively, it was almost completely removed. Furthermore, when NH4+-N (similar to 105.68 mg/L) and NO3--N (similar to 100.40 mg/L) were the composite nitrogen sources, the RE of NH4+-N and NO3--N were 99.17% and 94.07% in 24 h, respectively. The RE of NH4+-N was up to 99.31% when NH4+-N (similar to 102.33 mg/L) and NO2-- N (similar to 114.56 mg/L) used as composite nitrogen sources, and NO2--N was completely removed. Community composition analysis revealed that the dominant phyla were Proteobacteria and Bacteroidetes; and the dominant genera were Paracoccus, Pannonibacter, Taibaiella, Pelagibacterium and Stappia. Gene functional analysis for the nitrogen cycle showed the presence of amoB, hao, narG, nirS, nirK, and nosZ genes; however, nxrA, hzo, hzs, napA, and nasA were not detected. These findings revealed that a possible novel mechanism of nitrogen removal using hao gene to oxidize NH2OH to NO instead of NO2--N by SND microbes.
摘要：
Pyroptosis, a new mode of regulatory cell death, holds a promising prospect in tumor therapy. The occurrence of pyroptosis can trigger the release of damage-associated molecular patterns (DAMPs) and activate the antitumor immune response. Moreover, enhancing intracellular reactive oxygen species (ROS) generation can effectively induce pyroptosis. Herein, an integrated nanoplatform (hCZAG) based on zeolitic imidazolate framework-8 (ZIF-8) with Cu2+ and Zn2+ as active nodes and glucose oxidase (GOx) loading is constructed to evoke pyroptosis. GOx can effectively elevate intracellular hydrogen peroxide (H2O2) levels to regulate the unfavorable tumor microenvironment (TME). Cu2+ can be reduced to Cu+ by endogenous overexpressed GSH and both Cu2+ and Cu+ can exert Fenton-like activity to promote ROS generation and amplify oxidative stress. In addition, the accumulation of Cu2+ leads to the aggregation of lipoylated dihydrolipoamide S-acetyltransferase (DLAT), thus resulting in cuproptosis. Notably, the outburst of ROS induced by hCZAG activates Caspase-1 proteins, leads to the cleavage of gasdermin D (GSDMD), and induces pyroptosis. Pyroptosis further elicits an adaptive immune response, leading to immunogenic cell death (ICD). This study provides effective strategies for triggering pyroptosis-mediated immunotherapy and achieving improved therapeutic effects. Yolk-shell nanostructured hCZAG with Cu2+ and Zn2+ as active nodes and GOx-loading are successfully constructed. hCZAG can enhance ROS generation through chemodynamic therapy (CDT) and cuproptosis via cascade reactions. The accumulation of ROS induces pyroptosis, which can further activate immune response by promoting the release of damage-associated molecular patterns (DAMPs). Thus, the integrated nanoplatform can achieve remarkable antitumor efficacy. image
